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In fact, the 60-Plus Association, a conservative advocacy group for seniors that has ties to the activist billionaire Koch brothers, made two-thirds of its ad buys during newscasts — more than any other major political buyer.

With comedies, dramas and other shows having a younger and thus Democrat-dominated audience, newscasts are also one of the few places to find a fair share of Republicans.

Local newscasts on the four major networks all had slightly more Republican ads than Democratic ones. Among national news programs, “Face the Nation” is heavily Republican, thanks to three separate outside groups supporting Republican presidential nominee Mitt Romney.

On the partisan news shows, the tack is decidedly different. Yet politicians have occasionally waded into what they perceive as enemy territory: On “Fox News Sunday,” one-quarter of the political ads come from Democrats, thanks to Mr. Obama making more ad buys there than Mr. Romney in an effort to dampen enthusiasm for the Republican, who has had trouble invigorating the most-conservative in the audience.

See latest ad buys and a breakdown of advertising by TV show at